PROCEEDINGS OF THE CHEMICAL DEPARTMENT. 



493 



St Petersburg Linseed, No. 2. — This sample contained 15-58 

 of impurities, which consisted largely of wild mustard, and 

 several other small seeds, most of which appeared to be olea- 

 ginous, an opinion borne out by the results of analysis. 



Here the presence of 15 per cent, of impurities has produced 

 an appreciable effect on the composition of the eake which 

 would be yielded by the seed, an effect,, however,* restricted 

 mainly to the albuminous compounds, and to the mucilage, &c, 

 the former being diminished by rather more than 2§ per cent., 

 while the latter is higher to about the same extent. The ash of 

 the impure cake is also higher, as it must necessarily be, from 

 the presence of sand and dirt which must inevitably be found in 

 greater or less quantity in all samples of linseed. 



Mcmel Linseed. — The seeds in this sample were small in size, 

 somewhat dull on the surface, and it contained 28 - l8 per cent, of 

 impurities. These were of various kinds. Wild mustard and 



2k 



